Reconstructing the response of grounded ice sheets and sea ice to climatic changes by coring glacial bedforms and meltwater deposits in the Kveithola trough
The Project CORIBAR is based on a proposal for R/V Maria S. Merian ship time submitted to DFG and presently under consideration for scheduling in the year 2013 or 2014.
• To reconstruct the chronology of the deglaciation stages of the Svalbard/Barents Sea Ice Sheet (SBIS).
• To perform high-resolution studies on the palaeoceanographic and climatic changes over Marine Oxygen Isotope Stages 5 (6?) to 1, concentrating on glacial-interglacial changes as well as shorter-term millennial variability along the eastern margin of the Barents Sea and the northern North Atlantic regions during the past glacial stages and the deglaciation.
• To understand the mechanisms of generation and dispersal patterns of sediment-laden meltwater discharges.
• To investigate the sedimentation dynamics on glacially influenced continental slopes in response to the cyclic sediment deposition induced by glacial maxima and deglacial retreats.
• To understand the mechanisms of shelf depocentre formation and to use these deposits as environmental archive for the reconstruction of sea-level history, of palaeoceanographic conditions, and for an estimation of material volumes and sources.
• To assess the climate-model credibility in simulating high-latitude ocean and sea-ice processes by verification of simulations under palaeo-boundary conditions with sea-ice proxy reconstructions.
Project founding principles:
Rapid deglacial climatic changes in the northern Atlantic realm have forced the local ice sheet of the Kveithola trough and the sea ice to respond sensitively and rapidly. In turn, these ice dynamics have left particular footprints in the form of various glacigenic deposits.
The following scientific hypotheses will be tested:
1. The continental-slope deposits (Trough Mouth Fan systems, TMF) record the ice dynamics but have also interacted with the ocean-current system by lateral transport of sediments which could possibly had influence on the deep-water formation.
2. Variations in meltwater discharge, ice-stream dynamics, and sea-level lifting affected the ice sheet and are sensitively recorded by the ice-margin deposits (Grounded-Zone Wedge systems, GZW) inside the Kveithola trough.
3. The nearby shallow continental shelf was the local material source and confined depocenters in this area contain this particular geological signature.
4. The sea-ice history is closely linked to the climatic variability and had strong impact on the marine productivity and deep-water formation processes.
Project methodology: MeBo Drilling, coring.
Project PI: Till J.J. Hanebuth, MARUM, Universität Bremen
Participating Institutions: MARUM, Universität Bremen (Germany), ICREA (Barcelona, Spain), Institut de Ciències del Mar (CSIC), Barcelona (Spain), University of Barcelona (Spain), Istituto Nazionale di Oceanografia e di Geofisica Sperimentale (OGS), Trieste (Italy), University of Tromsø (Norway), Danish and Greenland Geological Survey (GEUS), Copenhagen (Denmark).
Main active investigators:
Rüdiger Stein, Alfred-Wegener-Institut für Polar- und Meeresforschung, Bremerhaven (Germany)
Tim Freudenthal, Marum - Zentrum für Marine Umweltwissenschaften, Universität Bremen (Germany)
Hendrik Lantzsch, MARUM – DFG-Forschungszentrum für Marine Umweltwissenschaften Universität Bremen (Germany)
Michele Rebesco, Istituto Nazionale di Oceanografia e di Geofisica Sperimentale, Trieste (Italy)
Roger Urgeles, Institut de Ciències del Mar (CSIC), Barcelona (Spain)
Angelo Camerlenghi, Faculty of Geology, University of Barcelona (Spain)
Karin Andreassen, Department of Geology University of Tromsø (Norway)
Caterina Morigi, Geological Survey of Denmark and Greenland, Copenhagen (Denmark)